可知应选A (2).C.细节理解题.根据第二段第一二句T he lowest part of the food chain are the plant s . T hey are called producers because they pr oduce their own food by using the sunlight's e nergy(食物链最低端是草,他们被叫做生产者是 因为他们利用阳光为自己生产食物)可知应选C ...
The logistic law has been used successfully in modeling the growth of Penicillium chrysogenum, a penicillin-producing organism [6]. In addition, the rate of production of penicillin has been mathematically quantified by the equation: dy2dt=k3y1−k4y2 Penicillin (y2) is produced at a rate ...
Modalites de la contamination de deux chaines trophiques dulcaquicoles par le cobalt 60: I: Contamination directe des organismes par l'eau 1. Introduction In order to evaluate Cobalt 60 behavior in freshwater ecosystems, two food chains including different nutritionally interdependent specie... C...
in specifed growing concentrations gives 16-24 hours incubation at 35-37�C, the cells are centrifuged a growth response by this organism that may be measured underneath aseptic conditions and the supernatant liquid decanted. Incubate plates at 35 � 2�C for 18-24 hours in an aerobic ...
John Gurdon discovered that nuclei from separate cells could grow a whole organism when they are transplanted into eggs with their original nuclei removed. This concept was used for a project to clone a sheep named Dolly. Electronic mail (e-mail) (1971) Country: US Inventor: Ray Tomlinson Ele...
This randomness in the biological evolutionary process is primarily due to genetic variation inside the organism and genetic drift induced by environmental factors. This suggests that biological character is not determined entirely by fitness. Rather, with small probability, it is affected by random dist...
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nuclei after cell division. They carry out energy transformations and biosynthetic actions and are able to replicate themselves. In addition to forming the interface between the cell and its exterior surroundings, additionally they are important in transportation of materials, group of various energy ...
membrane attack complex. This complex is assembled in lipid-containing cell membranes, which include the outer membrane of gramnegative micro organism and the plasma membrane of infected host cells. This lysis seems to be a central defense mechanism against meningococci and systemic gonococcal an ...
carefully calculated amount of a very carefully chosen strain of brewer’s yeast to the wort in an air-tight fermenter, the brewer leaves the unfermented wort in open-air “ships”, where any Tom, Dick and micro-organism blown through the open attic windows can fall into the beer and ...